/**
 * CS AI Platform - Design Tokens
 *
 * Brand colors from Classroom Secrets parent company.
 * Typography: Poppins (Google Fonts)
 * Spacing: 8px base scale
 */

:root {
    /* ========================================
       BRAND COLORS
       ======================================== */

    /* Primary palette */
    --color-lunar: #eb5b50;      /* Coral red - alerts, important */
    --color-adriatic: #00abc8;   /* Teal - primary brand, links */
    --color-dune: #ffb800;       /* Yellow/gold - CTAs, highlights */
    --color-apple: #6fba6c;      /* Green - success, "safe" messaging */
    --color-lilac: #cd80b9;      /* Purple - secondary accent */
    --color-blueberry: #494a93;  /* Deep purple - headings, emphasis */

    /* Neutrals */
    --color-slate: #777777;
    --color-light-slate: #acacac;
    --color-off-white: #f8f9fa;
    --color-white: #ffffff;
    --color-dark: #1a1a2e;

    /* Semantic colors */
    --color-primary: var(--color-adriatic);
    --color-secondary: var(--color-blueberry);
    --color-accent: var(--color-dune);
    --color-success: var(--color-apple);
    --color-warning: var(--color-dune);
    --color-danger: var(--color-lunar);

    /* Text colors */
    --color-text: var(--color-dark);
    --color-text-muted: var(--color-slate);
    --color-text-light: var(--color-light-slate);
    --color-text-inverse: var(--color-white);

    /* Background colors */
    --color-bg: var(--color-white);
    --color-bg-alt: var(--color-off-white);
    --color-bg-dark: var(--color-dark);

    /* ========================================
       TYPOGRAPHY
       ======================================== */

    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Font weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;

    /* Font sizes - using clamp for fluid typography */
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;   /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    --font-size-5xl: 3rem;       /* 48px */

    /* Line heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* ========================================
       SPACING (8px base)
       ======================================== */

    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */

    /* ========================================
       BORDERS & RADII
       ======================================== */

    --border-width: 1px;
    --border-width-thick: 2px;
    --border-color: var(--color-light-slate);
    --border-color-light: #e5e7eb;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* ========================================
       SHADOWS
       ======================================== */

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

    /* ========================================
       TRANSITIONS
       ======================================== */

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* ========================================
       Z-INDEX SCALE
       ======================================== */

    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-nav-shelf: 500;

    /* ========================================
       LAYOUT
       ======================================== */

    --container-max: 1200px;
    --container-narrow: 800px;
    --nav-shelf-width: 280px;
    --library-shelf-width: 340px;
    --header-height-app: 60px;
}